Re: asm vs raw - the smackdown

From: Greg Rahn <>
Date: Wed, 27 May 2009 11:16:38 -0700
Message-ID: <>

Both ASM and raw use the exact same system calls to issue I/O, so there is no performance difference based on function calls/call stack.

The ASM advantage is in the automatic striping of data over the LUNs (ASM disks) - the ASM logical layer. This reduces time to implement a well performing db layout as well as maintenance (disk additions & rebalanced) in the future. In other words, it takes much more time and effort to create a good layout with raw than it does with ASM.

On Wed, May 27, 2009 at 1:30 AM, ~Jeff~ <> wrote:
> Hi all
> does anyone know of any papers or study comparing ASM vs raw performance?
> We have a vendor deadset on raw, and the DbAs would rather not have to deal
> with that!
> thanks-
> Jeff Wong

Greg Rahn
Received on Wed May 27 2009 - 13:16:38 CDT

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